Ag<sup>+</sup>/Ag-TiO<sub>2</sub>纳米空心球制备及其可见光催化性能*

doi:10.11901/1005.3093.2014.300

材料研究学报

2014, Vol. 28

Issue (11): 865-872 DOI: 10.11901/1005.3093.2014.300

本期目录 | 过刊浏览

Ag⁺/Ag-TiO₂纳米空心球制备及其可见光催化性能*

石莉萍¹,刘纯^1,²(

),殷恒波²,王爱丽²,王丽君¹

1. 北华大学化学与生物学院吉林 132013
2. 江苏大学化学化工学院镇江 212013

Preparation and Visible Light Photocatalytic Activties of Hollow Nanospheres of Ag⁺/Ag-TiO₂

Liping SHI¹,Chun LIU^1,^2,^**(

),Hengbo YIN²,Aili WANG²,Lijun WANG¹

1. College of Chemistry and Biology, Beihua University, Jilin 132013
2. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013

引用本文:

石莉萍,刘纯,殷恒波,王爱丽,王丽君. Ag⁺/Ag-TiO₂纳米空心球制备及其可见光催化性能*[J]. 材料研究学报, 2014, 28(11): 865-872.
Liping SHI, Chun LIU, Hengbo YIN, Aili WANG, Lijun WANG. Preparation and Visible Light Photocatalytic Activties of Hollow Nanospheres of Ag⁺/Ag-TiO₂[J]. Chinese Journal of Materials Research, 2014, 28(11): 865-872.

全文: PDF(4182 KB) HTML

摘要:

在TiO₂/聚苯乙烯复合材料表面沉积硫化银, 空气中煅烧制备了Ag⁺/Ag修饰的二氧化钛纳米空心球(Ag⁺/Ag-TiO₂纳米空心球, 即Ag⁺/Ag-HTS)。结果表明, 所制备的Ag⁺/Ag-HTS具有可见光催化降解甲基橙的活性, 随着甲基橙的初始浓度降低其催化降解效率提高。肖特基势垒的形成有助于更多的空穴转移到材料的表面, 增强其光催化效率; 表面的Ag⁺有助于电子的清除, 防止光激电子与光激空穴复合。随着硫化银沉积数量的提高, Ag⁺/Ag-HTS的可见光催化活性提高, 其光催化降解甲基橙的反应具有假一级反应的动力学特征。使用25% Ag⁺/Ag-HTS光催化剂, 在可见光下照射2 h甲基橙降解率高达70.6%。

关键词 ：复合材料, 可见光催化剂, 肖特基势垒, 湿化学沉积法, 二氧化钛纳米空心球

Abstract：

Hollow nanospheres of Ag⁺/Ag-TiO₂(Ag⁺/Ag-HTS) were synthesized by a two step process i.e. firstly Ag₂S was deposited on the surface of TiO₂/polystyrene composites and subsequently the decorated composites were calcinated in air. The results show that all of the Ag⁺/Ag-HTS have good visible light photocatalytic activities for the photodegradation of methyl orange. It possesses a high efficiency for photodegradation of methyl orange as the solutions with low concentration of methyl orange. The presence of Schottky barrier may facilitate the migration of vacancies to the surface of Ag⁺/Ag-HTS and thereby enhance its photocatalytic efficiency. Ag⁺in the catalyst is helpful to scavenge photoelectrons to prevent the recombination of electrons and vacancies. The photocatalytic activity of the Ag⁺/Ag-HTS increases with the increase of the amount of deposited Ag₂S in the first step of synthesis process. The degradation of methyl orange by Ag⁺/Ag-modified hollow titania nanosphere photocatalysts fitted the pseudo-first-order kinetics. When the mass ratio of Ag₂S to TiO₂ was 25%, the photodegradation efficiency for methyl orange was up to 70.6% under visible light irradiation for 2 h.

Key words： composites visible light photocatalysis Schottky barrier wet chemical deposition method hollow titania nanosphere

收稿日期: 2014-06-26

基金资助:* 吉林省科技发展计划项目201105042、吉林省教育厅“十二五”规划项目(吉科教合字[2011]第140号,吉科教合字[2014]第187号)资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.300 或 https://www.cjmr.org/CN/Y2014/V28/I11/865

表1 不同样品Ag2SO4的相对量

表2 Ag+/Ag-HTS样品TiO2不同相的比率

图1 Ag+/Ag-HTS样品的XRD谱

图2 PSM、HTS和Ag+/Ag-HTS样品的SEM像

图3 HTS和Ag+/Ag-HTS样品的漫反射图, 插图为修正的Kubelka-Munck函数对hv作图

图4 HTS和Ag+/Ag-HTS样品修正的Kubelka-Munck函数对hv作图, 插图为相应的漫反射图

图5 在可见光(500W钨灯)照射下, Ag+/Ag-HTS、HTS、P25 存在时对甲基橙(5-20 mg·L-1)的降解

图6 甲基橙不同初始浓度的ln(c/c0)-t 图

图7 Ag+/Ag-HTS可见光催化反应机理

表3 甲基橙不同初始浓度的降解速率常数

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